when I try to install everything following the “get started” steps it fails when i go to the index, it appear to me this error lines:

Warning: Use of undefined constant PHPGRID_LIBPATH – assumed ‘PHPGRID_LIBPATH’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\grouping.php on line 14

Warning: include(PHPGRID_LIBPATHinc/jqgrid_dist.php): failed to open stream: No such file or directory in C:\xampp\htdocs\gridphp\demos\appearance\grouping.php on line 14

Warning: include(): Failed opening ‘PHPGRID_LIBPATHinc/jqgrid_dist.php’ for inclusion (include_path=’C:\xampp\php\PEAR’) in C:\xampp\htdocs\gridphp\demos\appearance\grouping.php on line 14

Warning: Use of undefined constant PHPGRID_DBTYPE – assumed ‘PHPGRID_DBTYPE’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\grouping.php on line 18

Warning: Use of undefined constant PHPGRID_DBHOST – assumed ‘PHPGRID_DBHOST’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\grouping.php on line 19

Warning: Use of undefined constant PHPGRID_DBUSER – assumed ‘PHPGRID_DBUSER’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\grouping.php on line 20

Warning: Use of undefined constant PHPGRID_DBPASS – assumed ‘PHPGRID_DBPASS’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\grouping.php on line 21

Warning: Use of undefined constant PHPGRID_DBNAME – assumed ‘PHPGRID_DBNAME’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\grouping.php on line 22

Fatal error: Uncaught Error: Class ‘jqgrid’ not found in C:\xampp\htdocs\gridphp\demos\appearance\grouping.php:25 Stack trace: #0 {main} thrown in C:\xampp\htdocs\gridphp\demos\appearance\grouping.php on line 25

don’t matter where I try to go it keep changing. If I try to go for example Appearance/External link it changes to this:

Warning: Use of undefined constant PHPGRID_LIBPATH – assumed ‘PHPGRID_LIBPATH’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\external-link.php on line 14

Warning: include(PHPGRID_LIBPATHinc/jqgrid_dist.php): failed to open stream: No such file or directory in C:\xampp\htdocs\gridphp\demos\appearance\external-link.php on line 14

Warning: include(): Failed opening ‘PHPGRID_LIBPATHinc/jqgrid_dist.php’ for inclusion (include_path=’C:\xampp\php\PEAR’) in C:\xampp\htdocs\gridphp\demos\appearance\external-link.php on line 14

Warning: Use of undefined constant PHPGRID_DBTYPE – assumed ‘PHPGRID_DBTYPE’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\external-link.php on line 18

Warning: Use of undefined constant PHPGRID_DBHOST – assumed ‘PHPGRID_DBHOST’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\external-link.php on line 19

Warning: Use of undefined constant PHPGRID_DBUSER – assumed ‘PHPGRID_DBUSER’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\external-link.php on line 20

Warning: Use of undefined constant PHPGRID_DBPASS – assumed ‘PHPGRID_DBPASS’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\external-link.php on line 21

Warning: Use of undefined constant PHPGRID_DBNAME – assumed ‘PHPGRID_DBNAME’ (this will throw an Error in a future version of PHP) in C:\xampp\htdocs\gridphp\demos\appearance\external-link.php on line 22

Fatal error: Uncaught Error: Class ‘jqgrid’ not found in C:\xampp\htdocs\gridphp\demos\appearance\external-link.php:25 Stack trace: #0 {main} thrown in C:\xampp\htdocs\gridphp\demos\appearance\external-link.php on line 25

I tried to unstall and do it again a lot of times but it never works, can someone help me on it??